Lichens represent an intimate mutualistic relationship between a fungus and:
1. | an algae | 2. | a cyanobacterium |
3. | a brown alga | 4. | either 1 or 2 |
In mycorrhiza, the fungi help the plant in:
1. Synthesis of high energy carbohydrates
2. Absorption of essential nutrients from the soil
3. Nitrogen fixation
4. Biocontrol of pathogens
The fig tree is pollinated by a:
1. | Honeybee | 2. | Wasp |
3. | Bird | 4. | Moth |
To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:
1. Sexual deceit
2. Pseudo-copulation
3. Reward in the form of nectar
4. Place for laying eggs
A population with a population pyramid that has an extremely broad base will most likely be:
1. | a rapidly expanding population |
2. | a stable population |
3. | a population where the birth rate equaled the death rate |
4. | a population where there were more old than young individuals |
In the formula for exponential growth (dN/dt = rN), what does ‘r’ stand for?
1. | the carrying capacity of the environment |
2. | the change in time |
3. | the number of individuals in the population |
4. | the intrinsic rate of natural increase of the population |
Assertion (A): | In every species, there are trade- offs between survival and reproductive traits. |
Reason (R): | Natural selection favors traits that improve an organism’s chances of survival and reproductive success. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
When Darwin spoke of the struggle for existence, he was convinced that a potent force in organic evolution is:
1. | Intraspecific competition | 2. | Interspecific competition |
3. | Intraspecific mutualism | 4. | Interspecific mutualism |
MacArthur showed that five closely related species of warblers living on the same tree were able to avoid competition and co-exist due to:
1. | Behavioral differences in their foraging activities. |
2. | Pre-zygotic reproductive isolation mechanisms |
3. | Physiological differences in acclimatization |
4. | Gene differentiation |
The human liver fluke depends on two intermediate hosts that are:
1. | A crustacean and a fish |
2. | A snail and a fish |
3. | An echinoderm and a fish |
4. | Fishes of two different species |